Improvement in steam-generators



E. & J. BOUR NE STEAM GENERATOR.

No. 37.382. Patented Jan. 13, 1863.

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UNITED STATES PATENT OFFICE.

IMPROVEMENT IN STEAM- GENERATORS.

Specification forming part of Letters Patent No. 37,382, dated January13, 1863.

To all whom it may concern.-

Be it known that we, EDWARD BopENE and J OHN BOURNE, of the city ofPittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented a new and usefullmprove.

ment in Self-Regulating Steam-Generators;

and we do hereby declare thatthe following is Y a full, clear, and exactdescription ofthe construction and operation of the san1e,'re'ferencebeing had to the accompanying drawings, which form partof thisspecificatiomandto the letters of reference marked thereon, in which-Figure 1 represents apcrspective view of a steam'boiler with ourimprovement attached. Fig. 2 is a vertical section of the same, showingthe interior of the boiler and the arrangement of the doors of thefire-box and ash-pit. Fig. 3represen ts a vertical section of the boilerand appendages transverse to the feed-door, and illustrates the methodof supplying the water.

All the parts are lettered, and similar letters indicate like parts onall the figures.

Our invention consists of an improvement in that class ofsteam-generators wherein the generation of steam is regulated by openingand closing the feed and ash-pit doors automatically, so as to changeand reverse the draft,

.causing it to pass over the fire, instead of underneath and through it,when the steam in;

creases beyond a certain point by the varying pressure in the boiler.

The improvement we have made enables usto accomplish this in a verysimple and economical manner, and for this purpose we construct ourboiler of wrought-iron in any of the known forms, but prefer a verticalcylinderboiler having the fire-box inside as being the most convenient.To this is applied the usual feed-water pipe 0, safety-valve d, and theother appendages of such boilers, but in order to regulate the draft,and thereby the generation of steam, we apply to the top of the boiler Aa hollow spherical chamber, 0, and communicating therewith by means of asuitable pipe, 'n. This chamber is made in halves, the lower half beingattached to the pipe n that connects it with the boiler. An elastic diskor heady), Fig. 2, having a step, 1, in its center, is placed across itsmouth. The upper half is now put in position, and the whole securedtogether by screw-bolts e a. passing through the flanges ff, formed oneach half of the chamber. The step .l.in the center of the elastic head7' is made of hard metal, and is intended to carry the stem 8, whichworks loosely through a hole" in the center of the upper half of thechamber. This stem is attached to a weighted lever, B,

(the operation of which will be hereinafter described.) Secured to thislever is a rod, W, extending down the outside of the boiler to thefeed-door Grand ash pitdoorg. The mouths of the furnace and ash-pitextend out some distance from the boiler. Pivoted to the sides of theseextending months are a couple of small levers, T and K,Fig. 1, one endof which are attached to the aforesaid rod W. The other end of theseleversact against the under sides of the doors G g,-which are made toproject over the mouths of the furnace next the levers for that purpose.Through the rod W, just be.- low where it is attached to the weightedlever before mentioned, is a longslot, m, through which the safety-valvelever extends sufficiently far to prevent its getting out of place.Thisis for accomplishing that which will be described by the operationof the improvements we have made as follows: The water being conveyed tothe projecting chamber to by means of the pipe 0, and from thence to theboiler through another pipe. at, the waterrises until thefloat z islifted, when the supply is cut oft by the faucetp,thepressureon thefloatbeing counterbalanced by the steamentering the chamber, in which'itworks through the small pipe I) that enters the boiler above the water.-line. Fire being placed in the furnace and steam generated, the waterwill ascend the pipe n, Fig. 2, and press against the elastic head inthe spherical chamber 0, the parts remaining stationary until it passesa given pressure, when the weighted lever R'is raised, and by means ofthe rod W lifts the lever T beneath the feed-door G of the furnace,which opens and reverses the draft, causing it to pass over thefire,instead of underneath it. This reversal has a tendency to deaden thefire and stop the generation of steam, but in case the generation shouldgo on, notwithstanding the reversal of the draft, the additionalpressure upon the elastic head 1' will force up the weighted lever Buntil the bottom of the slot at in the rod W comes in contact with thelever H of the satety valve d, opening said valve and allowing allexcess of steam to pass off fre ly through the escape-pipe N underneaththe grate-bars 3 Whenthe fireis deadened at once, and furtheraccumulation of steam prevented, but as soon as the pressure of thesteam is gone the weighted lever R falls,closing the safety-valve. andby means of the rod W changes the position of the levers T and Koperating the doors of the furnace, whereby the feed-door G is closed,and the ash-pit door '9 is opened, and a further generation of stean'icommenced and is carried on very rapidly as the flue L for the passageof the smoke passes up through the body of the boiler.' This modeot'regulating the (71' ift is applicable to all kinds ofsteam-generating boilers, but is more particularly adapted to that classused for warmingdwellings and for the purpose ot'convcying' the steam tothe radiators used in such cases. We apply a pipe, 71 with the properand necessary stop-cock t to the top of the boiler, and, also, to insurethe falling of the \veightedlever R, we make a series of holes, .20 00,through the top. of the spherical chamber 0, which admits of all steamthat accumulatesabove the thin flexible disk or head 1 to escape, andinsures the free Working of the parts.

Having thus described our invention, what We claim is-- I 1. Thecombination and arrangement of the short levers T and K and rod W withthe elastic head 1" in theohamber (J, substantially in the manner andfor the purposes as herein set forth.

2. Assisting the safety-valve to rise when necessary by means of the rodW acting against the lever H that holds the valve down, for the purposeofenabling the steam to escape, as herein set forth.

EDWARD BOURNE. JOHN BOURNE.

Witnesses:

J. W. ELLs, H. A, DALTON.

